Riko, a novice angel who decided to work at a certain cafe in order to make someone's love come true. While struggling with his first encounter with the human world, he tries to improve the relationship between the two regular customers of the cafe as a cupid in love... The kind and reliable store manager, Jin, turns out to be a demon who makes people unhappy! "I can't fall in love with Jin-san..." What is the fate of this forbidden love between an angel and a devil?